What is wrong with these two pairs?
https://en.numista.com/catalogue/pieces80917.html
https://en.numista.com/catalogue/pieces81390.html
and
https://en.numista.com/catalogue/pieces81389.html
https://en.numista.com/catalogue/pieces44198.html
I suspect that they are not doubles, but metals are wrong. Any thoughts?
Jarek